Malicious PDF — malware analysis report

Static analysis result for SHA-256 97881cf229df087b…

MALICIOUS

PDF

83.4 KB Created: 2021-03-22 05:23:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 84dc184fd59c4ddcc69e14715418f698 SHA-1: 9d834a08d0103cd3dad41fd36ee9ab8bfda424ff SHA-256: 97881cf229df087b1e6c64629963166f163e3197276075f0e76ad003f093b0b7
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to disposable domains, indicative of a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://seumenha.ru/wix?keyword=skyrim+find+the+redguard+woman PDF link annotation
    • http://verification-help.business/lepikasogusoxuxelevawakilgt4uv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4528260/normal_603ec0fd73c97.pdfIn PDF document text
    • https://cdn.sqhk.co/bomemenun/ZmDmib7/xibefazesugegelilewof.pdfIn PDF document text
    • https://cdn.sqhk.co/kobewudojuvo/jwRqIja/hide_speakers_cables.pdfIn PDF document text
    • http://skidki-day.shop/adobe_camera_raw_converter0edhg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377098/normal_6049e6311a619.pdfIn PDF document text
    • http://ottics.ru/tim_ferriss_height1xeaf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403413/normal_6003571ba956a.pdfIn PDF document text
    • http://pristav.pro/xosudumepaxakupugarubi0fjix.pdfIn PDF document text
    • https://cdn.sqhk.co/janurisu/jVifhgU/33286696412.pdfIn PDF document text
    • https://cdn.sqhk.co/jisaside/Ibjcgd3/fluent_icon_pack.pdfIn PDF document text
    • https://favonewe.weebly.com/uploads/1/3/2/6/132695639/kawutazo.pdfIn PDF document text
    • https://basavorulifa.weebly.com/uploads/1/3/4/8/134899730/tijusowadanar.pdfIn PDF document text
    • https://bebamewikirebu.weebly.com/uploads/1/3/0/8/130874540/karawos.pdfIn PDF document text
    • https://geridaradekod.weebly.com/uploads/1/3/1/4/131437552/gazegipiw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sazariwapa/50434949082.pdfIn PDF document text
    • https://7fd672c9-0ac8-42d3-9d3c-9ebb2fbea2b4.filesusr.com/ugd/92785a_9da762da0b5841649249c14ef5afe84c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wonumafubij/49977638276.pdfIn PDF document text
    • https://7a69a04d-b0b3-478e-a927-895b34d3dd44.filesusr.com/ugd/159848_549b50da16e34663b0cfaba5800822f4.pdf?index=trueIn PDF document text
    • https://ce55c564-0e79-48ac-bd91-a034cff8554b.filesusr.com/ugd/bd1fc0_65b60a26c49c49ed8713ed14ec9f8061.pdf?index=trueIn PDF document text
    • https://b1706aec-e9b1-4c6c-9a93-f14ef4a1c402.filesusr.com/ugd/3b47cb_cb2c81c2afdb40a5aa9c9d364f6ea360.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bepukuba/turkish_march_piano_sheet_music.pdfIn PDF document text
    • https://88bec3ce-9cdd-4818-a95b-bcf8ac49d1e7.filesusr.com/ugd/72df48_622e8338c3da4ced9c50c9a3d6515724.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC12 3088 bytes
SHA-256: e8ec97a3b0a2b35cf48281e69a2760485808b4e5a6bd661cb5a5d83f93a14696
font_01_sfnt_off00010737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10737 5472 bytes
SHA-256: 17339b2c24ddd3d3ad6cf02aae5e1438cb1dc4f9e5b9f45b80d569c9113ad52b
font_02_sfnt_off000119c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C3 11240 bytes
SHA-256: 9903e617fbec14bf1c4ebe92c04e3352f86d545795c5d4deb1c75beec6e955ec